D. Use at, in, on 1. I hope your holiday August was great fun.
2. The birds started singing half past four this morning.
3. Pat's uncle left Canada 1968 and went to Brazil.
4. We work in the garden the weekends.
5. I swim in the sea every day summer.

1. I hope your holiday at August was great fun.

2. The birds started singing at half past four this morning.

3. Pat's uncle left Canada in 1968 and went to Brazil.

4. We work in the garden on the weekends.

5. I swim in the sea every day in summer.

you mustn't go out. it is raining heavily. 2) your room is messy. you must do your room and wash the floor.

every week

если имеется в виду, что надо дать какой-то показатель, который будет указывать на то, что это настоящее простое время используется works